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Material Container Transform animation not working in Java

Im trying to use Material Container Transform in Recyclerview Adapter as described by this post MaterialContainerTransform transition is not Working on Return , but after implementing this in my project im getting null pointer exception error.
As everyone know Material Container Transform animation tutorials are in kotlin and im doing it in java.
So if anyone know how to properly use material container transform animation in recyclerview and point out my mistakes i will be very much thankful to him.
RecyclerView Adapter Class(source)
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> implements Filterable {
private Context context;
private List<Astadhyayi> wordList;
private List<Astadhyayi> filwordList;
private DictionaryDB dictionaryDB;
private OnclickListenerInterface listener;
public RecyclerViewAdapter(Context context, List<Astadhyayi> itemList, DictionaryDB dictionaryDB) {
this.context = context;
this.wordList = itemList;
this.dictionaryDB = dictionaryDB;
filwordList = new ArrayList<Astadhyayi>(itemList);
}
public void setClickListener(OnclickListenerInterface onclickListener) {
this.listener = onclickListener;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.wordslist_two_rv, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
Astadhyayi word = wordList.get(position);
holder.rsutras.setText(word.mSutras);
// Animation******
holder.rsutras.setTransitionName(word.getMSutras());
if (word.mStatus != null && word.mStatus.equals(DictionaryDB.BOOKMARKED)) {
holder.bookmark.setImageResource(R.drawable.cards_heart);
} else {
holder.bookmark.setImageDrawable(null);
}
}
#Override
public Filter getFilter() {
return Searched_Filter;
}
private Filter Searched_Filter = new Filter() {
#Override
protected FilterResults performFiltering(CharSequence constraint) {
List<Astadhyayi> filteredList = new ArrayList<>();
if (constraint == null || constraint.length() == 0) {
filteredList.addAll(filwordList);
} else {
String filterPattern = constraint.toString().toLowerCase().trim();
for (Astadhyayi item : filwordList) {
if (item.getMSutras().toLowerCase().contains(filterPattern)) {
filteredList.add(item);
}
}
}
FilterResults results = new FilterResults();
results.values = filteredList;
return results;
}
#Override
protected void publishResults(CharSequence constraint, FilterResults results) {
wordList.clear();
wordList.addAll((ArrayList<Astadhyayi>)results.values);
notifyDataSetChanged();
}
};
#Override
public int getItemCount() {
return wordList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView rsutras;
private ImageView bookmark;
public ViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
rsutras = itemView.findViewById(R.id.tvSansTerm);
bookmark = itemView.findViewById(R.id.bookmarkBtn);
}
/*
#Override
public void onClick(View view) {
if(listener!=null) listener.onItemClicked(getAbsoluteAdapterPosition(), rsutras);
}
*/
#Override
public void onClick(View view) {
int position = this.getAbsoluteAdapterPosition();
Astadhyayi word = wordList.get(position);
//*************** Bundle **************\\
Bundle bundle = new Bundle();
bundle.putParcelable("allData", word);
bundle.putString("transition_name", word.getMSutras());
Fragment detailsFragment = new TermThreeDetailsFragment();
detailsFragment.setSharedElementEnterTransition(new MaterialContainerTransform());
detailsFragment.setArguments(bundle);
FragmentTransaction fT =((AppCompatActivity)context).getSupportFragmentManager().beginTransaction();
fT.setReorderingAllowed(true);
fT.addSharedElement(rsutras, rsutras.getTransitionName()); // Shared element!
fT.replace(R.id.fragment_container, detailsFragment);
fT.addToBackStack(null);
fT.commit();
}
}
}
RecyclerView Fragment Class(source)
public class ShowtermsTwoFragment extends Fragment {
private RecyclerView rv;
private EditText tV;
private Toolbar toolbar;
private LinearLayoutManager layoutManager;
private static DictionaryDB db;
private RecyclerViewAdapter rvAdapter;
private SearchView searchView = null;
private SearchView.OnQueryTextListener queryTextListener;
private List<Astadhyayi> wordsList = new ArrayList<>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setExitTransition(new MaterialElevationScale(false));
setReenterTransition(new MaterialElevationScale(true));
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_terms_recyclerview, container, false);
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
toolbar = ((Toolbar) view.findViewById(R.id.toolbar_rv));
rv = view.findViewById(R.id.rvTerms);
tV = view.findViewById(R.id.tVinput);
//*********** TOOLBAR
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.setSupportActionBar(toolbar);
setHasOptionsMenu(true);
// new Get_DbData().execute();
databaseCheck();
recyclerCheck1();
postponeEnterTransition();
((ViewGroup) view.getParent()).getViewTreeObserver()
.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
startPostponedEnterTransition();
return true;
}
});
}
private void databaseCheck() {
String sanskritWord = getActivity().getIntent().getStringExtra("sanskritWord");
//*********** ### DATABASE OPENING ### ***********\\
db = DictionaryDB.getInstance(this.getActivity());
wordsList = db.getWords((sanskritWord));
}
private void recyclerCheck1() {
layoutManager = new LinearLayoutManager(getContext());
rv.setLayoutManager(layoutManager);
rv.setHasFixedSize(true);
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(rv.getContext(), layoutManager.getOrientation());
rv.addItemDecoration(dividerItemDecoration);
rvAdapter = new RecyclerViewAdapter(getContext(), wordsList, db);
rv.setAdapter(rvAdapter);
/////********** rvAdapter.setClickListener(this);
rvAdapter.notifyDataSetChanged();
}
}
Details Fragment Class(destination)
public class TermThreeDetailsFragment extends Fragment {
private TextView sutraTV,vrittiTV,padaTv,adhyayTV,sutraIdTV ;
private CoordinatorLayout coordinatorLayout;
private FloatingActionButton fabBtn;
private static DictionaryDB db;
private Astadhyayi word;
private BottomAppBar bottomAppBar;
private TextToSpeech pronunciation;
private AudioManager audio;
private String ttsID , trans;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MaterialContainerTransform transform = new MaterialContainerTransform();
transform.setScrimColor(Color.TRANSPARENT);
setSharedElementEnterTransition(transform);
setSharedElementReturnTransition(transform);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.show_three_details, container, false);
view.findViewById(R.id.tvSutra).setTransitionName(word.getMSutras());
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
sutraTV = view.findViewById(R.id.tvSutra);
adhyayTV = view.findViewById(R.id.tVAdhyay);
padaTv = view.findViewById(R.id.tVPada);
sutraIdTV = view.findViewById(R.id.tVSutraId);
vrittiTV = view.findViewById(R.id.tvVritti);
fabBtn = view.findViewById(R.id.favFAB);
coordinatorLayout = view.findViewById(R.id.parentCordlayout);
bottomAppBar = view.findViewById(R.id.bottom_app_bar);
bundleCheckWithDb();
WordCheck();
}
private void bundleCheckWithDb() {
//*********** Geting Parcelable Data
word = new Astadhyayi(Parcel.obtain());
Bundle bundle = this.getArguments();
if (bundle != null) {
word = bundle.getParcelable("allData");
trans = bundle.getString("transition_name");
adhyayTV.setText(word.getMAdhyay());
padaTv.setText(word.getMPada());
sutraIdTV.setText(word.getMSutra_id());
sutraTV.setText(word.getMSutras());
vrittiTV.setText(word.getMVritti());
}
//*********** DATABASE OPENING
db = DictionaryDB.getInstance(this.getActivity());
}
private void WordCheck() {
if (word.mStatus != null && word.mStatus.equals(DictionaryDB.BOOKMARKED)) {
fabBtn.setImageResource(R.drawable.cards_heart);
} else {
fabBtn.setImageResource(R.drawable.cards_heart_white);
}
fabBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
bookMarkWord(word, fabBtn);
}
});
}
}
Error im getting
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.sanskrit.mysearcher.models.Astadhyayi.getMSutras()' on a null object reference
at com.sanskrit.mysearcher.fragments.TermThreeDetailsFragment.onCreateView(TermThreeDetailsFragment.java:69)

From the current given information, I think you should do something like this:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
word = new Astadhyayi(Parcel.obtain());
Bundle bundle = this.getArguments();
if (bundle != null) {
word = bundle.getParcelable("allData");
}
View view = inflater.inflate(R.layout.show_three_details, container, false);
view.findViewById(R.id.tvSutra).setTransitionName(word.getMSutras());
return view;
}
Again, I am not sure what getMSutras() actually returns and if it's right to use that here.

How can i pass a string value from recyclerview adapter to fragment

I want to pass a string value from my adapter class to my fragment. I tried storing the string in a bundle. To retrieve the value i used Bundle b = getArguments(); b.getString("key") the problem is im getting a null pointer exception. Below is the code that saves the string in a bundle. So my question is how can i pass a string value from adapterA to fragmentB.
Thanks in advance.
Adapter.java
public class ToDoRecyclerViewAdapter extends RecyclerView.Adapter<ToDoRecyclerViewAdapter.ViewHolder> {
private Context context;
private List<Aktivnost_> mValues;
private final OnListFragmentInteractionListener mListener;
public ToDoRecyclerViewAdapter td;
public ToDoRecyclerViewAdapter(List<Aktivnost_ > items, Context context, OnListFragmentInteractionListener listener) {
mValues = items;
mListener = listener;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.fragment_todo, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.mItem = mValues.get(position);
holder.mContentView.setText(mValues.get(position).getNaziv());
holder.mDateView.setText(mValues.get(position).getDatum());
holder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (null != mListener) {
mListener.onListFragmentInteraction(holder.mItem);
Intent i = new Intent(context.getApplicationContext(), PodrobnostiActivity.class);
i.putExtra("task_id", mValues.get(position).getId_());
context.getApplicationContext().startActivity(i);
Toast.makeText(v.getContext(), "task - " + mValues.get(position).getId_(), Toast.LENGTH_SHORT).show();
}
}
});
holder.mView.setOnLongClickListener(new View.OnLongClickListener() {
#Override
public boolean onLongClick(final View v) {
AlertDialog.Builder adb = new AlertDialog.Builder(v.getContext());
CharSequence meni[] = new CharSequence[] {"DOING", "FINISHED"};
adb.setItems(meni, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
if(i == 0) {
Bundle b = new Bundle();
DoingFragment d = new DoingFragment();
mValues.get(i).setStanje("doing");
b.putString("doing", mValues.get(i).getStanje());
d.setArguments(b);
} else {
mValues.get(i).setStanje("koncano");
}
}
});
AlertDialog alertDialog = adb.create();
alertDialog.setCancelable(true);
alertDialog.show();
return true;
}
});
}
#Override
public int getItemCount() {
return mValues.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public final View mView;
public final TextView mContentView;
public final TextView mDateView;
public long id;
public Aktivnost_ mItem;
public ViewHolder(View view) {
super(view);
mView = view;
this.id = id;
mDateView = (TextView) view.findViewById(R.id.Date);
mContentView = (TextView) view.findViewById(R.id.content);
}
#Override
public String toString() {
return super.toString() + " '" + mContentView.getText() + "'";
}
}
}
And i want to get the value i set in bundle in this fragment.
Fragment.java
public class DoingFragment extends Fragment {
DoingFragmentRecyclerViewAdapter mAdapter;
private OnListFragmentInteractionListener mListener;
public DoingFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_doingfragment_list, container, false);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.list_doing);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.addItemDecoration(new DividerItemDecoration(getContext(), LinearLayoutManager.VERTICAL));
mAdapter = new DoingFragmentRecyclerViewAdapter(listAktivnosti(),mListener);
recyclerView.setAdapter(mAdapter);
return view;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnListFragmentInteractionListener) {
mListener = (OnListFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnListFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnListFragmentInteractionListener {
void onListFragmentInteraction1(Aktivnost_ item);
}
AppDatabase db;
public void openDB() {
db = new AppDatabase(getContext());
db.open();
}
Aktivnost_ ak;
List<Aktivnost_> array;
public List<Aktivnost_> listAktivnosti() {
array = new ArrayList<>();
openDB();
Bundle b = getArguments();
Cursor cursor = db.getAllRows(b.getString("doing"));
while(cursor.moveToNext()) {
ak = new Aktivnost_();
ak.setId_(cursor.getLong(cursor.getColumnIndex("_id")));
ak.setNaziv(cursor.getString(cursor.getColumnIndex("naziv")));
ak.setDatum(cursor.getString(cursor.getColumnIndex("datum")));
ak.setFk_projekt(cursor.getInt(cursor.getColumnIndex("fk_projekt")));
ak.setUdeleženci(cursor.getString(cursor.getColumnIndex("udelezenci")));
ak.setStanje(cursor.getString(cursor.getColumnIndex("stanje")));
array.add(ak);
}
return array;
}
}

From the code, I can see you are only setting the Bundle parameters in Fragment object, but not using that fragment object further.
You need to display that fragment object first, then it will reflect into your target fragment.

Delete Item from RecyclerView and Realm DB

Image
I have an EditText which adds items to this RecyclerView and to the Realm DB. That works fine. The problem is that I don't know how to remove those items from both the RecyclerView and from the Realm DB. Should this be done on the Fragment or on the adapter? And how? Thanks!
There is an image on top showing a screenshot of the app.
Here is the Fragment where the RecyclerView is:
public class FragmentMyList extends Fragment{
private RecyclerView recyclerView;
private EditText editTxt;
private FloatingActionButton btn;
private Item item;
private ArrayList<Item> itemList;
private AdapterItemsRecycler adapterItemsRecycler;
private Realm realm;
RealmResults<Item> results;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View vistaADevolver = inflater.inflate(R.layout.fragment_my_list, container, false);
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
Realm.init(getContext());
realm = Realm.getDefaultInstance();
editTxt = (EditText)vistaADevolver.findViewById(R.id.editText);
btn = (FloatingActionButton) vistaADevolver.findViewById(R.id.button);
recyclerView = (RecyclerView) vistaADevolver.findViewById(R.id.recyclerViewToDo);
itemList = new ArrayList<>();
results = realm.where(Item.class).equalTo("id", 1).findAll();
final InputMethodManager inputManager = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
adapterItemsRecycler = new AdapterItemsRecycler(results, getActivity(), new ItemsListener());
recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(new SimpleItemDivider(getActivity()));
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(),LinearLayoutManager.VERTICAL, false));
recyclerView.setAdapter(adapterItemsRecycler);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String itemName = editTxt.getText().toString();
saveIntoDatabase(itemName);
inputManager.hideSoftInputFromWindow(getView().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
editTxt.getText().clear();
adapterItemsRecycler.notifyDataSetChanged();
}
});
return vistaADevolver;
}
#Override
public void onDestroy() {
super.onDestroy();
realm.close();
}
private void saveIntoDatabase(final String itemName) {
realm.executeTransactionAsync(new Realm.Transaction() {
#Override
public void execute(Realm bgRealm) {
item = bgRealm.createObject(Item.class);
item.setName(itemName);
item.setPoint(itemName);
item.setId(1);
Fragment fragment = new Fragment();
Bundle bundle = new Bundle();
bundle.putString("POINT", item.getPoint());
fragment.setArguments(bundle);
itemList.add(item);
}
}, new Realm.Transaction.OnSuccess() {
#Override
public void onSuccess() {
// Transaction was a success.
Log.v("database", "Stored ok");
}
}, new Realm.Transaction.OnError() {
#Override
public void onError(Throwable error) {
// Transaction failed and was automatically canceled.
Log.e("database", error.getMessage());
}
});
}
class ItemsListener implements AdapterView.OnClickListener{
#Override
public void onClick(View view) {
Item itemTouched = results.get(recyclerView.getChildAdapterPosition(view));
EscuchadorInterface unEscuchador = (EscuchadorInterface)getActivity();
unEscuchador.itemSelected(itemTouched);
}
}
public interface EscuchadorInterface{
public void itemSelected(Item anItem);
}
}
My RecyclerView adapter:
public class AdapterItemsRecycler extends RecyclerView.Adapter {
private RealmResults<Item> itemList;
private Context context;
private View.OnClickListener listener;
private Realm realm;
public AdapterItemsRecycler(RealmResults<Item> itemList, Context context, View.OnClickListener listener) {
this.itemList = itemList;
this.context = context;
this.listener = listener;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, final int viewType) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.my_list_detail, parent, false);
view.setOnClickListener(listener);
ItemViewHolder itemViewHolder = new ItemViewHolder(view);
return itemViewHolder;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
Item item = itemList.get(position);
ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
itemViewHolder.loadItem(item);
}
#Override
public int getItemCount() {
return itemList.size();
}
private class ItemViewHolder extends RecyclerView.ViewHolder{
private TextView itemText;
private ImageButton imageButton;
public ItemViewHolder(View view) {
super(view);
itemText = (TextView) view.findViewById(R.id.textViewItemNameTD);
imageButton = (ImageButton) view.findViewById(R.id.delete);
}
public void loadItem(Item item) {
itemText.setText(item.getName());
imageButton.setImageResource(R.drawable.trash);
}
public ImageButton getImageButton() {
return imageButton;
}
}
}
RecyclerView's detail:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:design="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
tools:context="com.segunfamisa.sample.bottomnav.MainActivity">
<ImageButton
android:id="#+id/delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:tint="#03A9F4"
android:scaleType="centerInside"
android:background="#ffffff"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:onClick="deleteItem"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/textViewItemNameTD"
android:textSize="14dp"
android:textColor="#212121"
android:background="#ffffff"
android:padding="10dp"
android:layout_toRightOf="#+id/delete"/>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/arrow"
android:scaleType="centerInside"
android:background="#ffffff"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"/>
</RelativeLayout>

Just use RealmRecyclerViewAdapter with the RealmResults directly, which handles synchronization between database and list and adapter automatically.
public class FragmentMyList
extends Fragment {
private RecyclerView recyclerView;
private EditText editTxt;
private FloatingActionButton btn;
private AdapterItemsRecycler adapterItemsRecycler;
private Realm realm;
RealmResults<Item> results;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View vistaADevolver = inflater.inflate(R.layout.fragment_my_list, container, false);
getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
Realm.init(getContext());
realm = Realm.getDefaultInstance();
editTxt = (EditText) vistaADevolver.findViewById(R.id.editText);
btn = (FloatingActionButton) vistaADevolver.findViewById(R.id.button);
recyclerView = (RecyclerView) vistaADevolver.findViewById(R.id.recyclerViewToDo);
results = realm.where(Item.class).equalTo("id", 1).findAll();
final InputMethodManager inputManager = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
adapterItemsRecycler = new AdapterItemsRecycler(results, new ItemsListener());
recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(new SimpleItemDivider(getActivity()));
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false));
recyclerView.setAdapter(adapterItemsRecycler);
btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String itemName = editTxt.getText().toString();
saveIntoDatabase(itemName);
inputManager.hideSoftInputFromWindow(getView().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
editTxt.getText().clear();
}
});
return vistaADevolver;
}
#Override
public void onDestroy() {
super.onDestroy();
realm.close();
}
private void saveIntoDatabase(final String itemName) {
realm.executeTransactionAsync(new Realm.Transaction() {
#Override
public void execute(Realm bgRealm) {
Item item = bgRealm.createObject(Item.class);
item.setName(itemName);
item.setPoint(itemName);
item.setId(1);
}
}, new Realm.Transaction.OnSuccess() {
#Override
public void onSuccess() {
// Transaction was a success.
Log.v("database", "Stored ok");
}
}, new Realm.Transaction.OnError() {
#Override
public void onError(Throwable error) {
// Transaction failed and was automatically canceled.
Log.e("database", error.getMessage());
}
});
}
class ItemsListener
implements AdapterView.OnClickListener {
#Override
public void onClick(View view) {
Item itemTouched = results.get(recyclerView.getChildAdapterPosition(view));
EscuchadorInterface unEscuchador = (EscuchadorInterface) getActivity();
unEscuchador.itemSelected(itemTouched);
}
}
public interface EscuchadorInterface {
public void itemSelected(Item anItem);
}
}
// compile 'io.realm:android-adapters:2.0.0'
public class AdapterItemsRecycler
extends RealmRecyclerViewAdapter<Item, ItemViewHolder> {
private View.OnClickListener listener;
public AdapterItemsRecycler(OrderedRealmCollection<Item> itemList, View.OnClickListener listener) {
super(itemList, true);
this.listener = listener;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, final int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.my_list_detail, parent, false);
view.setOnClickListener(listener);
ItemViewHolder itemViewHolder = new ItemViewHolder(view);
return itemViewHolder;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
Item item = getData().get(position);
ItemViewHolder itemViewHolder = (ItemViewHolder) holder;
itemViewHolder.loadItem(item);
}
private static class ItemViewHolder
extends RecyclerView.ViewHolder {
private TextView itemText;
private ImageButton imageButton;
public ItemViewHolder(View view) {
super(view);
itemText = (TextView) view.findViewById(R.id.textViewItemNameTD);
imageButton = (ImageButton) view.findViewById(R.id.delete);
}
public void loadItem(Item item) {
itemText.setText(item.getName());
imageButton.setImageResource(R.drawable.trash);
}
public ImageButton getImageButton() {
return imageButton;
}
}
}
private void deleteFromDatabase(final String itemName) {
realm.executeTransactionAsync(new Realm.Transaction() {
#Override
public void execute(Realm bgRealm) {
Item item = bgRealm.where(Item.class).equalTo("name", itemName).findFirst();
if(item != null) {
item.deleteFromRealm();
}
}
}, new Realm.Transaction.OnSuccess() {
#Override
public void onSuccess() {
// Transaction was a success.
Log.v("database", "Delete ok");
}
}, new Realm.Transaction.OnError() {
#Override
public void onError(Throwable error) {
// Transaction failed and was automatically canceled.
Log.e("database", error.getMessage());
}
});
}

activity doesn't get displayed onClick

a problem in my code arose after fixing some other bugs. My activity which "should" show detailed information of movies doesn't get displayed properly instead, just a blank activity opens.
my detail activity:
public class detailsActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details);
Intent intent = getIntent();
String fragment = intent.getExtras().getString("FRAGMENT");
if(fragment.equals("MOVIE")) {
MovieGridFragment frag = new MovieGridFragment();
getSupportFragmentManager().beginTransaction().replace(R.id.fl_detail_fragment,frag).commit();
} else {
getFragmentManager().beginTransaction().replace(R.id.fl_detail_fragment, new displayMovieDetails()).commit();
}
}}
the mainActivity :
public class MainActivity extends AppCompatActivity implements clickInterfaceHelper {
public static String sorterString = null;
public static String urlBase = "https://api.themoviedb.org/3/movie/";
public static String urlFinal = null;
RequestQueue requestQueue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedInstanceState == null) {
MovieGridFragment fragment = new MovieGridFragment();
fragment.setClickListener(this);
getSupportFragmentManager().beginTransaction()
.add(R.id.activity_container, fragment)
.commit();
movieData.movieDataPosition = 0;
}
if(savedInstanceState != null) {
sorterString = savedInstanceState.getString("SORTER");
}
if(savedInstanceState == null)
movieData.movieDataPosition = 0;
if(sorterString==null)
sorterString="popular?";
if(sorterString!="favorite" && sorterString!=null) {
if(networkChecker.isNetworkAvailableChecker(this)) {
movieRequest();
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu_act, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if(id == R.id.m_popularity_action) {
if(sorterString != "popular?") {
sorterString = "popular?";
if(networkChecker.isNetworkAvailableChecker(this))
movieRequest();
}
return true;
}
if(id == R.id.m_action_voter) {
if(sorterString != "top_rated?") {
sorterString = "top_rated?";
if(networkChecker.isNetworkAvailableChecker(this))
movieRequest();
}
return true;
}
if(id == R.id.m_favorite_btn) {
if(sorterString != "favorite") {
SQLiteOpenHelper helper = new movieDataDbHelper(this);
SQLiteDatabase database = helper.getReadableDatabase();
Cursor cursor= database.query(movieDataContract.contractEntry.TABLE_NAME,
new String[] {
movieDataContract.contractEntry.ID,
movieDataContract.contractEntry.IMG_PATH},null,null,null,null,null);
if(cursor.getCount() == 0) {
Toast.makeText(this, "there are no favorite movies yet!",Toast.LENGTH_SHORT).show();
} else {
sorterString = "favorite";
showFavoriteFragment();
}
database.close();
helper.close();
cursor.close();
}
return true;
}
return super.onOptionsItemSelected(item);
}
public void showFavoriteFragment() {
favoriteMoviesDetailsFragment fragment = new favoriteMoviesDetailsFragment();
try {
getFragmentManager().beginTransaction().replace(R.id.activity_container,fragment).commit();
} catch (Exception e) {
e.printStackTrace();
}
}
#Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
outState.putString("SORTER", sorterString);
outState.putInt("POSITION",movieData.movieDataPosition);
super.onSaveInstanceState(outState, outPersistentState);
}
public void movieRequest() {
final MovieGridFragment gridFragment = new MovieGridFragment();
gridFragment.setClickListener(this);
urlFinal = urlBase + sorterString + movieData.apiKey;
urlFinal.trim();
requestQueue = Volley.newRequestQueue(this);
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, urlFinal, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray array = response.getJSONArray("results");
movieData.movieDataArray = new movieData[array.length()];
for (int i = 0; i < array.length(); i++) {
movieData movie = new movieData();
JSONObject jsonObject = array.getJSONObject(i);
movie.setMovieId(jsonObject.getString("id"));
movie.setMovieImagePath(jsonObject.getString("poster_path"));
movie.setMovieTitle(jsonObject.getString("original_title"));
movie.setMoviePlot(jsonObject.getString("overview"));
movie.setMovieVoting(jsonObject.getString("vote_average"));
movie.setMovieReleaseDate(jsonObject.getString("release_date"));
movieData.movieDataArray[i] = movie;
}
gridFragment.movieDataList = Arrays.asList(movieData.movieDataArray);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.activity_container, gridFragment);
try {
transaction.commitAllowingStateLoss();
} catch (Exception e) {
e.printStackTrace();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Log.e("volley", String.valueOf(error));
}
}
);
requestQueue.add(jsonObjectRequest);
}
#Override
public void clickOnItem(int id) {
movieData.movieDataPosition = id;
if(movieData.movieDataArray == null) {
movieRequest();
} else {
Intent intent = new Intent(this, detailsActivity.class);
intent.putExtra("FRAGMENT","MOVIE");
startActivity(intent);
}
}
#Override
public void favoriteMovieItem(int movieId) {
movieData.dbPosition = movieId;
Intent intent = new Intent(this,detailsActivity.class);
intent.putExtra("FRAGMENT","favorite");
startActivity(intent);
}
}
and the movieFragment which should display the data:
public class MovieGridFragment extends Fragment {
public clickInterfaceHelper clickListener;
private GridView movieGridView;
private int index;
public List<movieData> movieDataList = new ArrayList<>();
public MovieGridFragment() {} //empty constructor
#Override
public void onAttach(Context context) {
//this.clickListener = (clickInterfaceHelper) context;
super.onAttach(context);
}
public void setClickListener(clickInterfaceHelper listener) {
this.clickListener = listener;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setHasOptionsMenu(true);
if(movieDataList.isEmpty() && networkChecker.isNetworkAvailableChecker(getContext())) {
movieDataList = new ArrayList<movieData>();
}
if(!movieDataList.isEmpty() && !networkChecker.isNetworkAvailableChecker(getContext())) {
movieDataList = new ArrayList<movieData>();
}
if(savedInstanceState != null) {
index = savedInstanceState.getInt("INDEX");
if(movieDataList.isEmpty()) {
movieDataList.addAll(Arrays.asList((movieData[]) savedInstanceState.getSerializable("OLDMOVIEDATA")));
}
}
View rootView = inflater.inflate(R.layout.movie_display_fragment, container, false);
movieGridView = (GridView) rootView.findViewById(R.id.gv_movie_display);
movieAdapter adapter = new movieAdapter(getActivity(),movieDataList);
adapter.notifyDataSetChanged();
movieGridView.setAdapter(adapter);
movieGridView.smoothScrollToPosition(index);
movieGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if(clickListener != null)
clickListener.clickOnItem(position);
}
});
return rootView;
}
#Override
public void onSaveInstanceState(Bundle outState) {
outState.putSerializable("OLDMOVIEDATA",movieData.movieDataArray);
outState.putInt("INDEX",movieGridView.getFirstVisiblePosition());
super.onSaveInstanceState(outState);
}
}
the activity_details layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".detailsActivity">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/fl_detail_fragment">
</FrameLayout>
</LinearLayout>

You should use getSupportFragmentManager().beginTransaction().add() for the first time.
Then when you added a fragment before you should use getSupportFragmentManager().beginTransaction().replace()
EDIT
public class MovieGridFragment extends Fragment {
public clickInterfaceHelper clickListener;
private GridView movieGridView;
private int index;
public List<movieData> movieDataList = new ArrayList<>();
public void setMovieDataList(List<movieData> movieDataList) {
this.movieDataList = movieDataList;
}
public void setClickListener(clickInterfaceHelper listener) {
this.clickListener = listener;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setHasOptionsMenu(true);
View rootView = inflater.inflate(R.layout.movie_display_fragment, container, false);
movieGridView = (GridView) rootView.findViewById(R.id.gv_movie_display);
if (movieDataList != null) {
initMovieGrid();
}
return rootView;
}
private void initMovieGrid() {
movieAdapter adapter = new movieAdapter(getActivity(), movieDataList);
adapter.notifyDataSetChanged();
movieGridView.setAdapter(adapter);
movieGridView.smoothScrollToPosition(index);
movieGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (clickListener != null)
clickListener.clickOnItem(position);
}
});
}
}
To use the fragment:
MovieGridFragment fragment = new MovieGridFragment();
fragment.setClickListener(this);
fragment.setMovieDataList(movieDataList);
getSupportFragmentManager().beginTransaction()
.add(R.id.activity_container, fragment).commit();
If you don't have the the list of movies before you use your fragment, you could use this code for fragment:
public class MovieGridFragment extends Fragment {
public clickInterfaceHelper clickListener;
private GridView movieGridView;
private int index;
public List<movieData> movieDataList = new ArrayList<>();
public void setMovieDataList(List<movieData> movieDataList) {
this.movieDataList = movieDataList;
if (movieDataList != null) {
initMovieGrid();
}
}
public void setClickListener(clickInterfaceHelper listener) {
this.clickListener = listener;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
setHasOptionsMenu(true);
View rootView = inflater.inflate(R.layout.movie_display_fragment, container, false);
movieGridView = (GridView) rootView.findViewById(R.id.gv_movie_display);
return rootView;
}
private void initMovieGrid() {
movieAdapter adapter = new movieAdapter(getActivity(), movieDataList);
adapter.notifyDataSetChanged();
movieGridView.setAdapter(adapter);
movieGridView.smoothScrollToPosition(index);
movieGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (clickListener != null)
clickListener.clickOnItem(position);
}
});
}
}
Then create your fragment without using setMovieDataList() and when you get the movies data, use the method setMovieDataList()
public class MainActivity extends AppCompatActivity implements clickInterfaceHelper {
//...
MovieGridFragment mFragment;
//...
Create:
mFragment = new MovieGridFragment();
fragment.setClickListener(this);
getSupportFragmentManager().beginTransaction()
.add(R.id.activity_container, fragment).commit();
After you get the data:
mFragment.setMovieDataList(movieDataList);

You should prepend Intent extras with an unique identifier, but i'm not sure if this is what's causing the problem.

I'm very sorry for your effort but i'm just plain out stupid...
I opened the wrong Fragment....

Button setOnClickListener in a ListView

I'm trying to get the onclick event of a button inside a listview, but it's not working
fragment_contact.xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="404dp"
android:layout_weight="0.64"
android:orientation="horizontal"
android:paddingBottom="40dip" >
<ListView
android:id="#+id/contactlistview"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_gravity="fill"
android:layout_weight="10"
android:textSize="5pt"
android:visibility="visible" />
</LinearLayout>
fragment_contact_content.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:weightSum="1">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="#+id/btn_edit_contact"
android:layout_gravity="right" />
</LinearLayout>
FragmentContact.java
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_contact, container, false);
ListAdapter adapter_contact = new SimpleAdapter(
getActivity(), allcontact,
R.layout.fragment_contact_content, new String[]{"name", "level", "function", "phone", "email"},
new int[]{R.id.contact, R.id.level, R.id.function, R.id.phone, R.id.email});
listview_contact = (ListView) view.findViewById(R.id.contactlistview);
listview_contact.setItemsCanFocus(true);
listview_contact.setAdapter(adapter_contact);
Button btn_edit_contact = (Button) view.findViewById(R.id.btn_edit_contact);
btn_edit_contact.setOnClickListener( new View.OnClickListener() {
#Override
public void onClick(View v) {
System.out.println("Do something");
}
});
return view;
}
I also tried inflating fragment_contact_content.xml but the button still does nothing.

Use custom Adapter and in getView Write your code
public class MealAdapter extends BaseAdapter{
private int mHour, mMinute;
int minutes,hour;
String strtime;
customButtonListener customListner;
private Context context;
private List<Meal> rowItems;
public MealAdapter(Context context, List<Meal> rowItems) {
this.context = context;
this.rowItems = rowItems;
}
#Override
public int getCount() {
return rowItems.size();
}
#Override
public Object getItem(int position) {
return rowItems.get(position);
}
#Override
public long getItemId(int position) {
return rowItems.indexOf(getItem(position));
}
private class OptionHolder
{
ImageButton btn_time;
ImageButton btn_delete;
}
#Override
public View getView(final int position, View convertView, final ViewGroup parent) {
// TODO Auto-generated method stub
final OptionHolder holder;
if (convertView == null)
{
LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
convertView = mInflater.inflate(R.layout.meal_list_item, null);
holder = new OptionHolder();
holder.btn_time= (ImageButton) convertView.findViewById(R.id.btn_time);
holder.btn_delete =(ImageButton) convertView.findViewById(R.id.btn_delete_meal);
convertView.setTag(holder);
}
else
{
holder = (OptionHolder) convertView.getTag();
}
final Meal row_pos=rowItems.get(position);
row_pos.setMeal("");
row_pos.setDetail("");
holder.ed_meal.setText(row_pos.getMeal());
holder.ed_detail.setText(row_pos.getDetail());
holder.ed_time.setText(row_pos.getTime());
holder.btn_time.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
final Calendar c = Calendar.getInstance();
mHour = c.get(Calendar.HOUR_OF_DAY);
mMinute = c.get(Calendar.MINUTE);
// Launch Time Picker Dialog
TimePickerDialog tpd = new TimePickerDialog(MealPlannerFragment.con,
new TimePickerDialog.OnTimeSetListener() {
#Override
public void onTimeSet(TimePicker view, int hourOfDay,
int minute) {
// Display Selected time in textbox
strtime=(hourOfDay + ":" + minute);
row_pos.setTime(strtime);
row_pos.setMunite(minute);
row_pos.setHour(hourOfDay);
holder.ed_time.setText(row_pos.getTime());
}
}, mHour, mMinute, false);
tpd.show();
}
});
holder.btn_delete.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
if (customListner != null) {
customListner.onButtonClickListner(position,row_pos);
}
}
});
return convertView;
}
public interface customButtonListener {
public void onButtonClickListner(int position,Meal row_pos);
}
public void setCustomButtonListner(customButtonListener listener) {
this.customListner = listener;
}
}
`

you can not get Listview cell's Button event directly in onCreateView. you have to make CustomAdapter class for that.
you will need to create a Custom ArrayAdapter Class which you will use to inflate your xml layout, as well as handle your buttons and on click events.
public class MyCustomAdapter extends BaseAdapter implements ListAdapter {
private ArrayList<String> list = new ArrayList<String>();
private Context context;
public MyCustomAdapter(ArrayList<String> list, Context context) {
this.list = list;
this.context = context;
}
#Override
public int getCount() {
return list.size();
}
#Override
public Object getItem(int pos) {
return list.get(pos);
}
#Override
public long getItemId(int pos) {
return list.get(pos).getId();
//just return 0 if your list items do not have an Id variable.
}
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.fragment_contact_content, null);
}
//Handle button and add onClickListener
Button editBtn = (Button)view.findViewById(R.id.btn_edit_contact);
editBtn.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v) {
//do something
//some other task
notifyDataSetChanged();
}
});
return view;
}
}
Finally, in your activity you can instantiate your custom ArrayAdapter class and set it to your listview
public class MyActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_activity);
//generate list
ArrayList<String> list = new ArrayList<String>();
list.add("item1");
list.add("item2");
//instantiate custom adapter
MyCustomAdapter adapter = new MyCustomAdapter(list, this);
//handle listview and assign adapter
ListView lView = (ListView)findViewById(R.id.my_listview);
lView.setAdapter(adapter);
}
You can refer this link: http://www.c-sharpcorner.com/UploadFile/9e8439/create-custom-listener-on-button-in-listitem-listview-in-a/
just handle on click listener inside getview where you find the button using findviewbyid
I hope it helps!